Bank Reserves vs Reverse Repo
Bank reserves at the Federal Reserve (FRED:WRESBAL) and the overnight reverse repo facility (FRED:RRPONTSYD) are the two largest non-currency liabilities on the Fed balance sheet, and the split between them is the cleanest weekly read on whether the Fed's tightening is draining the banking system or the money fund buffer. WRESBAL stood at $2.902 trillion as of April 22, 2026 (week-average), and RRP take-up has run near $98 billion to $300 billion through the first four months of 2026, down from the December 30, 2022 peak of $2.554 trillion.
Also known as: Reserve Balances at Fed (reserve balances, bank reserves, liquidity) · Overnight Reverse Repo (RRP, reverse repo, ON RRP)
Why This Comparison Matters
Bank reserves at the Federal Reserve (FRED:WRESBAL) and the overnight reverse repo facility (FRED:RRPONTSYD) are the two largest non-currency liabilities on the Fed balance sheet, and the split between them is the cleanest weekly read on whether the Fed's tightening is draining the banking system or the money fund buffer. WRESBAL stood at $2.902 trillion as of April 22, 2026 (week-average), and RRP take-up has run near $98 billion to $300 billion through the first four months of 2026, down from the December 30, 2022 peak of $2.554 trillion. The pair traces the regime shift from RRP-as-buffer to reserves-at-the-floor.
What the two legs of this specific pair actually measure
The Federal Reserve's H.4.1 release each Thursday reports the consolidated balance sheet of the Federal Reserve System. On the liability side, Federal Reserve notes (currency in circulation) and Treasury General Account balances are mostly mechanical, while reserves and RRP are the two policy-active liabilities that absorb or release liquidity into the financial system. WRESBAL captures the week-average of bank reserves held at the twelve Federal Reserve Banks, and RRPONTSYD captures the previous-business-day take-up at the Federal Reserve's overnight reverse repo facility. Both are FRED-published, both update at high frequency, and both are direct outputs of the H.4.1.
The arithmetic identity that binds them is the Fed's asset side: as the Fed's Treasury and MBS holdings change through QE, QT, and reinvestment, the corresponding liability change must land somewhere, and most of it lands in either reserves or RRP. When the Fed buys Treasuries from a primary dealer, the dealer's bank credits its account at the Fed (reserves rise) or, if the dealer ultimately delivers cash to a money fund, the money fund's RRP balance rises. The split between the two is determined by the relative attractiveness of the deposit rate (IORB), administered by the Fed for banks, against the RRP rate, administered by the Fed for money funds. Both rates are typically set 5 to 10 basis points apart, with IORB above RRP since June 2021.
Conditional Forward Response (Tail Events)
How Overnight Reverse Repo has historically behaved in the 5 sessions following a top-decile or bottom-decile daily move in Reserve Balances at Fed. Computed from 257 aligned daily observations ending .
Following these triggers, Overnight Reverse Repo rises 59.40% on average over the next 5 sessions, versus an unconditional baseline of +65.36%. 26 qualifying events; Overnight Reverse Repo closed positive in 23% of them.
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Frequently Asked Questions
What is the difference between bank reserves and reverse repo?+
Bank reserves (FRED:WRESBAL) are deposits held by commercial banks at the twelve Federal Reserve Banks, on which the Fed pays Interest on Reserve Balances (IORB). Overnight reverse repo (FRED:RRPONTSYD) is a Fed-administered facility where eligible counterparties (primarily money market funds, also some GSEs and primary dealers) lend cash to the Fed overnight against Treasury collateral and receive the RRP rate. Both are Fed liabilities, both are interest-bearing, and the split between them is determined by the relative attractiveness of IORB to banks versus RRP to money funds. The IORB-RRP differential has been 5 to 10 basis points since June 2021.
Why did reverse repo balances drain from $2.55 trillion to near zero?+
RRP take-up peaked at $2.554 trillion on December 30, 2022 and fell to approximately $98 billion by December 2024, a $2.45 trillion drain over twenty-four months. Three drivers compounded. T-bill supply rose sharply after the June 2023 debt-ceiling resolution as the Treasury rebuilt the TGA, providing money funds with a higher-yielding alternative to RRP. The RRP rate was repeatedly trimmed (most notably the December 2024 5 basis point reduction below the bottom of the funds rate target range), reducing the relative attractiveness. Money fund total assets continued to grow through the period, but the marginal dollar increasingly went to T-bills rather than RRP because the yield differential favored T-bills by 10 to 25 basis points.
When does the Fed end QT, and what does it mean for the pair?+
The Fed slowed QT to a $25 billion monthly Treasury cap in May 2024, slowed it further to $5 billion in February 2025, and ended balance-sheet runoff entirely in December 2025. The Fed now reinvests maturing Treasuries to match trend reserve demand. The balance sheet has stabilized at approximately $6.7 trillion, with WRESBAL in a $2.85 to $2.95 trillion range and RRP near $300 billion. The pair has shifted from 'RRP-buffered ample reserves' to 'reserves-funded ample reserves', which is mechanically more supportive of private credit creation because reserves feed into bank lending while RRP balances do not.
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Data sourced from FRED, CoinGecko, CBOE, and other providers. This page is for informational purposes only and does not constitute financial advice. Past performance does not guarantee future results.